bug(ui): DateTimePicker issues

[edda]

• [ ] Datepicker placement becomes weird when the parent is narrower than the DatePicker
• [ ] Range DateTimePicker doesn't allow to pick a time for the start date, only for the end date

[TilmanHaupt]

The DatePicker has a problem in the Scheduled Silence Modal inside greenhouse. The DatePicker opens outside the shown parts of the Modal so you need to scroll to the right to actually use the modal. This bug is just appearing if the window / modal get very small.

The Layout of the range mode as possible workaround makes it not possible for me to define a start and end time. Just the end time is possible to set to a certain time in this case. I am also not sure if setting both dates with a time it would be confusing in the interface anyway.